The ohran viper is not cold-blooded. Its veins course with the same antigelid venom used to kill its prey.

Ohran Viper

Whenever Ohran Viper deals combat damage to a creature, destroy that creature at end of combat.Whenever Ohran Viper deals combat damage to a player, you may draw a card.

Whenever this creature deals combat damage to a creature, destroy that creature at end of combat.
Whenever this creature deals combat damage to a player, you may draw a card.

Whenever Ohran Viper deals combat damage to a creature, destroy that creature at the end of combat.
Whenever Ohran Viper deals combat damage to a player, you may draw a card.

Commander 2015

Duel Decks: Jace vs. Vraska

Whenever Ohran Viper deals combat damage to a creature, destroy that creature at end of combat.
Whenever Ohran Viper deals combat damage to a player, you may draw a card.